I just bought a 2018 People s150 and wondered the same thing,whats the gap for the valves.I did the first service myself,changed oils in engine and final drive,thats pretty much it.The dealer who sold the bike originally said he would send me info about servicing but I never got it.I rang Kymco in Melbourne in the support section and he said the same thing"i will send you the info".It never came,so I still dont know what the valve gap is.Have you had any luck?